Isobutene-isoprene (butyl) rubber (IIR)

Isobutene-isoprene (butyl) rubber, IIR, in primary forms

NO PGA · STANDARD CUSTOMS PROCEDURE

HSN 4002 31 00 (isobutene-isoprene (butyl) rubber, IIR) is not covered by a Bureau of Indian Standards Quality Control Order and carries no Partner Government Agency clearance requirement at the tariff-line level. Import follows the standard customs procedure: Importer-Exporter Code, bill of entry, commercial invoice, packing list. Other synthetic rubber types classified within Chapter 40 — such as halogenated butyls or styrene-butadiene rubber — may carry distinct compliance obligations depending on form and end-use.

No partner government agency notification covers this tariff line.

A word of counsel

The principal importer risk at this tariff line is misclassification: IIR supplied in a compounded, vulcanised, or fabricated form may be reclassified outside Chapter 40 primary-forms headings, triggering retrospective compliance and potential detention. Halogenated butyl rubber variants — chlorobutyl and bromobutyl — are separately classified within Chapter 40 and warrant independent verification. Confirm product specification, form, and any compounding against the customs tariff before relying on the absence of compliance at this line.

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Frequently asked

Does HSN 4002 31 00 require any pre-import registration?

A valid Importer-Exporter Code is required for any commercial import; no product-specific registration applies to this tariff line.

What changes if the butyl rubber is halogenated or supplied in a fabricated form?

Halogenated butyl rubber grades (chlorobutyl, bromobutyl) are classified under separate tariff lines within Chapter 40, and fabricated or compounded rubber articles may fall outside Chapter 40 primary-forms headings entirely, each with its own compliance profile.

Last verified against gazette notifications: 2026-05-16. Source: BIS / DGFT / Indian Customs CUSDATA.